In SX Microcontrollers, SX/B Compiler and SX-Key Tool, kgracey wrote:

Hello all,

You nailed it - it's the lack of capacitors on the SX Tech Board. This explains why the LED was dimming and no amount of benchtop power supply would fix my situation. I remember that Guenther used a big 3300 uF capacitor in the power supply when he put the SX Tech Board on his Boe-Bot chassis. 

I'm going to use the SX 28AC/SS Proto Board - we put a couple of larger caps across that power supply and added servo ports. 

Good call by everybody. I'll report back with results after I get a new circuit built on the SX Tech Board.

You don't want to know how much time I spent on this simple problem.

Thanks,

Ken Gracey
Parallax, Inc.

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